The Nineteenth hole is a slang term used in golf, generally referring to a pub, bar, or restaurant on or near the golf course, very often the clubhouse itself. A standard round of golf has only eighteen holes, so golfers will say they are at the 'nineteenth hole', meaning they are enjoying a drink after the game. The concept is similar to Après-ski in skiing.
The 19th hole on miniature golf, courses is often a hole in which if a hole-in-one is scored, one receives a free game.
At the beginning and again towards the end of the Lars von Trier movie Melancholia, the main character Claire is shown passing the nineteenth hole on the golf course belonging to the mansion where the movie takes place.
In a 1985 episode of Knight Rider entitled "The Nineteenth Hole" (Season 3, Episode 16), the term is used as slang, meaning the place where "they bury people who get in the way."